R is to RStudio as Git is to GitHub

Never have I ever:

• used 'cmd z' or 'ctrl z'
• came to the office but left the work at home on another machine or USB
• tried to co-author scripts by emailing files back and forth

Git is an open source version control tool, GitHub is a company that hosts Git repositories in the web and provides a web interface to interact with repos they host.

https://git-scm.com/

A better way to:

• “undo” changes,
• collaborate than mailing files back and forth, and
• share code and other scientific work with the world.

your local repository consists of three “trees” maintained by git. the first one is your Working Directory which holds the actual files. the second one is the Index which acts as a staging area and finally the HEAD which points to the last commit you've made.

• If you get stuck, just add “Git” to a search query e.g. a short description of your issue
• Someone else has also been confused by it and has written about it
• Thousands of talented programmers who scan the web and answer these problems

Install Git & join Github (if you have not already):

• install Git https://git-scm.com/downloads

• join Github https://github.com/

Some useful tips on getting these running from our friends

• University of Zurich http://www.geo.uzh.ch/microsite/reproducible_research/post/rr-rstudio-git/

• Nathan Stephens, a very helpful R blogger https://support.rstudio.com/hc/en-us/articles/200532077-Version-Control-with-Git-and-SVN

GitHub

• a commercial website that lets you store repository publicly for free get an education account with an uni email address
• a friendly interface, no need to remember command line.
• useful features including issues, wikis etc.

https://git-scm.com/

• git reset --soft HEAD~1 or commit SHA we undo our last commit, but the changes contained in that commit are not lost

• git reset --hard HEAD~1 or commit SHA we discard all changes we've made in the working directory

• git stash
  move the waiting changes out of the queue